﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Data;
using System.Windows;

namespace PresentItNow
{
    public class VisibilityConverter : IValueConverter
    {
        #region IValueConverter Members

        /// <summary>
        /// Converts a boolean value to Visiblitiy.Visible or Visiblity.Hidden
        /// </summary>
        /// <param name="value">The value produced by the binding source.</param>
        /// <param name="targetType">The type of the binding target property.</param>
        /// <param name="parameter">The converter parameter to use.</param>
        /// <param name="culture">The culture to use in the converter.</param>
        /// <returns>
        /// The Visibilitiy. If the input parameter is not a boolean the output is null.
        /// </returns>
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            if (!(value is bool))
                return null;

            bool bValue = (bool)value;

            if (bValue)
                return Visibility.Visible;

            return Visibility.Collapsed;
        }

        /// <summary>
        /// Convertes back - Not supported
        /// </summary>
        /// <param name="value">The value that is produced by the binding target.</param>
        /// <param name="targetType">The type to convert to.</param>
        /// <param name="parameter">The converter parameter to use.</param>
        /// <param name="culture">The culture to use in the converter.</param>
        /// <returns>
        /// A converted value. If the method returns null, the valid null value is used.
        /// </returns>
        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            throw new Exception("The method or operation is not implemented.");
        }

        #endregion
    }
}
